If your teen's phone is the first suspect whenever they seem stressed, withdrawn or short-tempered, you're in good company. Ontario has restricted phones in classrooms, several of the province's largest school boards have taken social media companies to court, and the headlines have been sounding the alarm for years.

But when researchers follow tens of thousands of teens over several years, the picture that emerges is more nuanced than "screens are bad," and, we think, more useful for parents. Here's what the most recent evidence actually says, and what to pay attention to instead.

First, the worry is justified

The concern about teen wellbeing isn't imagined. CAMH's 2025 Ontario Student Drug Use and Health Survey, based on more than 11,000 students in Grades 7 to 12, found that 46% reported moderate-to-serious psychological distress. That's an improvement from 51% in 2023, but still nearly double the 24% recorded a decade earlier. Three in ten students rated their mental health as fair or poor, compared with 15% ten years ago.

Social media use climbed over the same period. A quarter of Ontario students now spend five or more hours a day on social media, up from 11% in 2013.

So both lines rose together. The real question is whether one caused the other.

What the latest research found

Time on social media didn't predict later anxiety. In one of the largest studies of its kind, University of Manchester researchers followed more than 25,000 students aged 11 to 14 across three school years. Published in the Journal of Public Health in 2026, the study found no evidence that heavier social media use or frequent gaming increased symptoms of anxiety or depression the following year, for boys or girls. Whether teens were actively chatting or passively scrolling didn't change the result.

The arrow may point the other way. A 2025 Cambridge study in Nature Human Behaviour used clinical assessments of 3,340 UK young people aged 11 to 19. Teens with anxiety or depression spent more time on social media, compared themselves to others more often, and reported that likes and comments affected their mood more strongly. The researchers were careful to say they can't yet tell which comes first. For many teens, the feed may be where they go because they feel low, looking for distraction, reassurance or connection.

How teens use their phones matters more than how long. A 2025 study in JAMA followed over 4,000 young people from age nine or ten for four years. Total screen time at the start showed no link to later mental health. What did matter was compulsive use: feeling unable to stop, getting distressed without the phone, or using it to escape problems. Teens whose use followed that pattern had roughly double the risk of anxiety, depression and more serious outcomes. By age 14, nearly one in three showed a high compulsive-use pattern with social media.

None of this means social media is harmless. CAMH notes that online spaces can still expose teens to social comparison, cyberbullying, body image pressure and harmful content. Most of these studies also rely on teens' own reports. But the evidence is shifting the question from "How many hours?" to "What is my teen's relationship with their phone, and what's going on underneath it?"

What about phone bans at school?

Since September 2024, Ontario students in Grades 7 to 12 can't use phones during class unless a teacher directs it, and social media is blocked on school networks and devices.

The largest study of school phone restrictions so far, released in May 2026 by researchers at Stanford, Duke, Penn and Michigan, looked at more than 43,000 U.S. schools and focused on strict "locked pouch" policies. The bans did reduce phone use during the school day, but effects on test scores were close to zero, and attendance, attention and cyberbullying barely moved. Student wellbeing actually dipped in the first year, then rose above its starting point by year three.

The takeaway isn't that limits are pointless. It's that structure helps slowly, and removing the phone doesn't automatically fix what the phone was covering for.

What to watch instead of screen time

Rather than policing minutes, research points to four things worth your attention.

Sleep. This is where the evidence is most consistent. A study of adolescents across 18 European and North American countries, including Canada, linked intense and especially compulsive social media use to later bedtimes and shorter sleep. A Dutch study found that household rules about no internet in the hour before bed helped protect sleep, particularly before habits became entrenched. Charging phones outside the bedroom works best as a family routine rather than a punishment. Lost sleep is also one of the quiet contributors to academic burnout.

Signs of compulsion. Can your teen put the phone down when they want to? Do they become agitated without it, or reach for it every time something feels hard? Those patterns matter far more than a screen-time report.

How they feel afterwards. Ask, don't monitor. "Which apps leave you feeling better, and which ones worse?" often opens a more honest conversation than a new limit. The same curious, non-judgmental approach that helps after a bad report card works here too.

What's changed offline. Pulling away from friends, dropping activities they used to enjoy, or procrastinating on schoolwork are worth noticing. Heavier scrolling may be a symptom of stress rather than its source.

When to reach out for more support

CAMH found that 29% of Ontario students felt they needed professional mental health support in the past year but didn't seek it, and one common reason was worry that their parents would find out. Keeping conversations calm and open makes it easier for your teen to come to you first.

If you notice changes in mood, sleep, appetite or withdrawal that last more than a couple of weeks, talk to your family doctor or your teen's school guidance counsellor. Teens can also reach the Kids Help Phone any time at 1-800-668-6868 or by texting CONNECT to 686868.

The bottom line

Teen anxiety is real, and it deserves serious attention. But the latest research suggests the phone is often a mirror as much as a cause. Focusing on sleep, healthy routines and honest conversation will usually tell you more, and help more, than a stricter screen-time limit.

At GOAL Tutoring, we often see how closely a student's confidence in school is tied to how they're feeling overall. When learning feels more manageable, the evening scroll often loses some of its pull.

If school stress seems to be part of what your teen is carrying this term, we're happy to talk it through with you. Get in touch whenever it suits you.